Introduction
This guide will help you replace the logic board on your Sony Ericsson Xperia Pro MK16A phone. Follow along and you will have a new logic board installed in about half an hour.
Tools
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            Locate the battery in your phone. 
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            Find the divot below the battery. 
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            Use your thumb to lift the battery out of the phone. 
 
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            Remove the 4 black screws with the Phillips screwdriver. 
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            Remove the 4 silver screws with the Torx screwdriver. 
 
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            Insert the plastic opening tool in between the two halves of the case. Pry around the phone to detach the back case. 
 
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            Remove the last screw that is connecting the logic board using the Phillips screwdriver. 
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            Undo the two ribbons. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.